News Details
Water-based bicomponent polyurethane coating crosslinking agent
2017-6-13 11:48:39
Water-based bicomponent polyurethane coating crosslinking agent
Generally, it is necessary to achieve a good balance in order to achieve good anti-resistance performance, and require the combination of different products. One way to think about it is to choose a very soft, handfelt emulsion or dispersant to provide a sense of touch, and choose additives to provide resistance. Another idea is to choose a emulsion or a dispersion that is resistant to resistance.
For waterborne two-component polyurethane, our solution is to choose both handle and resistance performance of containing hydroxyl polyester/polyurethane dispersions, collocation is very soft, elongation at break of more than 1000%) of polyurethane dispersions with handle and wear-resisting performance of polyurethane dispersions with abrasion resistance performance.
By adding other polyisocyanate curing agent to improve crosslink density, and improve the good resistance to chemicals, sunscreen, and resistance to high temperature and high humidity resistance.
In the process, in addition to the isocyanate groups react with hydroxyl form polyurethane, there will be a small amount of - NCO react with water to form polyurea, high molecular weight polyurethane dispersions have been wrapped in polyurethane and polyurea reticular structure. Traditional polyisocyanate is hydrophobic, and hydrophilic dispersion mixing when has the problem of poor compatibility, can help cancel this tend to light, it can add right amount less extinction powder has reached a good patience, especially have high requirements for fouling resistance.
Preparation of two-component water-based polyurethane coating. Before feeding, need to know the pH range of all kinds of raw materials in advance, if necessary, you should add a small amount of amine (such as activity, dimethyl ethanolamine) were neutralized to ensure no too big in the whole process of the preparation of the pH swings.
Chinese name: Diethyl toluene diamine(DETDA)
Diethyltoluenediamine packing： net weight 200KG/ galvanized iron drum (a small cabinet pallet loaded 16 tons), 1000KG/IB barrels (a small cabinet loaded 18 tons or 23 tons of ISOTANK).
Mix lotions/dispersions feeding in the first pot, mix (about 3 m/min, about 10 min), and then slowly adding deionized water in sequence, wetting agent, defoamer, thickening agent and other additives, mixing (about 3 m/min, about 10 min), finally add extinction powder such as solid powder, pay attention to follow the principle of a few times when adding, slowly add, and stir well. Finally, at the speed of about 5m/min, the speed of stirring is about 20min. Stop stirring, and the A component is finished. And leave overnight for the night.
Before spraying, remove the right amount of A and add A proper amount of curing agent B, which is generally recommended for NCO/OH ratio between 1.5 and 2.5. If you use a water-friendly and manual dispersing agent, you can mix and mix the AB component by hand. However, if the use of hydrophobic curing agent is applied, it is recommended that the machine be dispersed for 5min.
Then filter, remove impurities or bubbles to be sprayed. The spraying construction viscosity recommends the mixing of about 40 ~ 60 (DIN 4 # cup), and control the final dry film thickness of about 40 ~ 60 mu m to achieve the desired feeling and resistance. The coating will be better if you have the right primer. According to the general baking process, room temperature dry 10 ~ 15 min, and then under the condition of 60 ~ 80 ℃ baking 30 ~ 40 min to touch dry.
Additional, still can add different pigment to match color at random, can match the soft feeling coating of different colour. Also can be made by different raw material choice, can prepare comfortable tactile feeling, silk slippery feeling, velvet feeling or the different soft feeling of rubber feeling.
Properties of water-based polyurethane coating. For the coating system that feels such special feeling of soft feeling, tactility and performance both need to be taken into consideration. Both to do special feels very soft and comfortable, and want to make performance meet the use requirements, such as chemical resistance, weatherability, sunscreen, hand sweat, wear resistance, etc., so softness coating need to seek a balance: both satisfied with handle, performance can meet again.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
Generally, it is necessary to achieve a good balance in order to achieve good anti-resistance performance, and require the combination of different products. One way to think about it is to choose a very soft, handfelt emulsion or dispersant to provide a sense of touch, and choose additives to provide resistance. Another idea is to choose a emulsion or a dispersion that is resistant to resistance.
For waterborne two-component polyurethane, our solution is to choose both handle and resistance performance of containing hydroxyl polyester/polyurethane dispersions, collocation is very soft, elongation at break of more than 1000%) of polyurethane dispersions with handle and wear-resisting performance of polyurethane dispersions with abrasion resistance performance.
By adding other polyisocyanate curing agent to improve crosslink density, and improve the good resistance to chemicals, sunscreen, and resistance to high temperature and high humidity resistance.
In the process, in addition to the isocyanate groups react with hydroxyl form polyurethane, there will be a small amount of - NCO react with water to form polyurea, high molecular weight polyurethane dispersions have been wrapped in polyurethane and polyurea reticular structure. Traditional polyisocyanate is hydrophobic, and hydrophilic dispersion mixing when has the problem of poor compatibility, can help cancel this tend to light, it can add right amount less extinction powder has reached a good patience, especially have high requirements for fouling resistance.
Preparation of two-component water-based polyurethane coating. Before feeding, need to know the pH range of all kinds of raw materials in advance, if necessary, you should add a small amount of amine (such as activity, dimethyl ethanolamine) were neutralized to ensure no too big in the whole process of the preparation of the pH swings.
Chinese name: Diethyl toluene diamine(DETDA)
Diethyltoluenediamine packing： net weight 200KG/ galvanized iron drum (a small cabinet pallet loaded 16 tons), 1000KG/IB barrels (a small cabinet loaded 18 tons or 23 tons of ISOTANK).
Mix lotions/dispersions feeding in the first pot, mix (about 3 m/min, about 10 min), and then slowly adding deionized water in sequence, wetting agent, defoamer, thickening agent and other additives, mixing (about 3 m/min, about 10 min), finally add extinction powder such as solid powder, pay attention to follow the principle of a few times when adding, slowly add, and stir well. Finally, at the speed of about 5m/min, the speed of stirring is about 20min. Stop stirring, and the A component is finished. And leave overnight for the night.
Before spraying, remove the right amount of A and add A proper amount of curing agent B, which is generally recommended for NCO/OH ratio between 1.5 and 2.5. If you use a water-friendly and manual dispersing agent, you can mix and mix the AB component by hand. However, if the use of hydrophobic curing agent is applied, it is recommended that the machine be dispersed for 5min.
Then filter, remove impurities or bubbles to be sprayed. The spraying construction viscosity recommends the mixing of about 40 ~ 60 (DIN 4 # cup), and control the final dry film thickness of about 40 ~ 60 mu m to achieve the desired feeling and resistance. The coating will be better if you have the right primer. According to the general baking process, room temperature dry 10 ~ 15 min, and then under the condition of 60 ~ 80 ℃ baking 30 ~ 40 min to touch dry.
Additional, still can add different pigment to match color at random, can match the soft feeling coating of different colour. Also can be made by different raw material choice, can prepare comfortable tactile feeling, silk slippery feeling, velvet feeling or the different soft feeling of rubber feeling.
Properties of water-based polyurethane coating. For the coating system that feels such special feeling of soft feeling, tactility and performance both need to be taken into consideration. Both to do special feels very soft and comfortable, and want to make performance meet the use requirements, such as chemical resistance, weatherability, sunscreen, hand sweat, wear resistance, etc., so softness coating need to seek a balance: both satisfied with handle, performance can meet again.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
Spanish
French
Italian
Portuguese
Japanese
Korean
Arabic
Russian